Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

#inclusivefixit

Bug: 161896447
Change-Id: I81c993e09ccf32b715d1d4df8735a4bd11f53749
Test: NA (Comment only)

services/appprediction/java/com/android/server/appprediction/AppPredictionPerUserService.java

@@ -228,7 +228,7 @@ public class AppPredictionPerUserService extends
         if (connected) {
             synchronized (mLock) {
                 if (mZombie) {
-                    // Sanity check - shouldn't happen
+                    // Validation check - shouldn't happen
                     if (mRemoteService == null) {
                         Slog.w(TAG, "Cannot resurrect sessions because remote service is null");
                         return;